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Leases - Components of operating lease expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2025	Jul. 31, 2024	Jan. 31, 2025
Leases
Operating lease cost	$ 998	$ 927	$ 1,957	$ 1,835
Short-term lease cost	152	116	289	236
Total operating lease cost	1,150	1,043	2,246	2,071
Operating cash outflows from operating leases included in measurement of lease liabilities	1,114	1,113	2,133	2,067
New right-of-use assets obtained in exchange for lease obligations	$ 1,065	$ 571	$ 1,455	$ 1,524
Weighted average remaining lease term (years)	2 years 9 months 18 days		2 years 9 months 18 days		2 years 10 months 24 days
Weighted average discount rate (%)	5.20%		5.20%		5.10%

X

- Definition

Amount of lease cost recognized by lessee for lease contract.

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- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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- Definition

Weighted average discount rate for operating lease calculated at point in time.

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- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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